Ultraplankton, photosynthetic bacteria, may be responsible for how much of the primary productivity near the ocean's surface?

Name: Ultraplankton, photosynthetic bacteria, may be responsible for how much of the primary productivity near the ocean's surface?
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Ultraplankton, which are very small photosynthetic organisms including bacteria, are responsible for about 70% of the primary productivity near the ocean's surface. They are crucial in the ocean's food web and carbon cycle.

Ultraplankton, Photosynthetic Bacteria, May Be Responsible for How Much of the Primary